Boiler



Sept.v 9 1924.`

R. N. MILLER BOILER origina Filed Dec. 22, 1920 2 shears-sheer 1 unI /J 43 /ff ff f 3 5 455 g z2 L 1 f- 4 F 1 z5 1 1. /35'3 :f J l J "410 *lg/"La o o o 1 Sept. 9 |924.

Original F1ed Dec. 22. 1929 2 Sheets-Sheet 2- Patented Sept. 9, 1924.

UNITE@ KFFCE.A

Bonne.

Original application led December 22,l 1920, Serial No. 432,474. Divided and this application filed August 17, 1921.

To all whomc't may concern: Be it known that I, ROBERT N; MILLER, a citizen of the United States, "and resident of Altoona, county of Blair, State of Pennsylvania, have invented certain new an useful Improvements in Boilers, of which the following is a speciication.

This invention relates to' vertical boilers and particularly to that type in which there is an outer cylindrical shell, upper land lower tube sheets, a series of vertical con# necting tubes and flues between Asaid tube sheets, a fire box in the lower part below the lower tube sheet and an outlet for smoke at the top. The present invention,

in combination with the superheater construction claimed in my Vco-pending application, Serial No. 432,474, filed December 22, 1920, of which this application is a division,'was designed primarily to produce and maintain the maximum constantly available steam 'power inl a' boiler construction of limited size. It was designed especially for useon locomotive cranes where the saturated fire tube type of boiler is usually .used either with or without submerged tubes but where the clearance 'room within vwhich such boilers are usedvis so. restricted that their steaming capacity lis usually below that called for by the service demands and where owing tothe intermittent service called for by the crane engine the steam supplied to these unitsbecomes saturated with moisture thus lowering the eiiciency and` causing excessive steam consumption per horse power hour. rlfhe present invention is intended to aid in'meeting and overcoming these difficulties although it isofcourse vnotzlino'ited to that particular use. It includes 'means for properly regulating by the exhaust steam the circulation of the.products of combustion to uniformly heat the flues, tubes and other parts of the boiler. The y novel features will more -fully appear from the following description and claims taken with the drawings.

In the drawings: l VFigure 1 shows a boiler embodying the invention largely in vertical section;

Figure 2 is an enlargedplan view looking down on the exhaust nozzle; and

Figure 3 is a cross section of the 0n the line 3- 3, Fig. 2.

As shown in the drawings the boiler con struction includes the outer cylindricalv shell nozzle 'openings or passageways serial Ne. 492,999.

10, an upper tube sheet`11 andalower tube sheet 12 and tubes and lue's `1,8 arranged ver-r tically` connecting the -two' tube sheets and furnishing passageways from the fire box d 414 to the smoke box 15. The lower-tube sheet 12 hasa down turned" edge 10 secured to the upper edge'ofthe tubular part 17 arranged centrally `withinthe Vshell .-10 and constitu-ting thewside walls of the fire box.l

The lower 'edge-of this tubular part '17 is connected to the lower edge ofthe shell 10 c byl the bottom" member'18 thus leaving a,

water space around the-fire box. There is a door opening and door 19 for the fire box andthe vusual gratev mechanism 20. y vThe boiler further includesfa cylindrical` extension suitably secured at'its lower `edge lto an upstaiiding flange on a superheater header 21, hereinafterdescribed, and a cover plate secured' to .the Aupper edgel of said extension. l .Y f

The superheater header 21 is Iannular in form and fits between and connects theupper tube sheet 11 .and thel shell 10 serving as a' marginal` closure for the; upper steam space of the boiler. Tt is preferably made in one piece of cast ysteel and is provided on its upper inner margin with an upstanding fiange 22 which fits and is riveted to the upturned marginalflange 23 on the upper tube sheet 11 and on its lowerzouter margin with a downwardlyv extending flange 24 riveted to the'shell'10 at' its, top. At the lower end of flange 22 the header 21 has a horizontal portion 25 the lower Isurface of which is in the same plane asthe lower surface of the upper tube sheet 11 and in effect constitutes -a continuation of; it asthe upper closure for 'the 'saturated steam space in the boiler. This horizontal portion isprovided at .intervals with vertical outlet openings 2,6 for saturated steam and the upper-'ends of these openings are'preferably boredy conicaliy at y27 to makea steam tight'joint with'the inlet end of a superheater unit header as hereinafter explained. Below the horizontal Aportion 25 the header 21 extends vdownwardly'in substantially cylindricalshape' tothe lower flange 24 but below that horizontal portion and above 'flange l 24 an annular superheated steam chamber 28 is formed entirely within it projecting inwardly into the saturated steam space of the boiler. This superheatedv steamy-chamber has -inlet not shown leadinef vertically to and through the horizon` tal .part closely adjacent tho the openings 26 and at their upper ends are preferably turned or ground to conical form to malte steam tight connection with the outlet header of a superheater unit. Superheatedsteam chamber is furthermore provided with an outlet 3l. leading tothe exterior of the boiler and adapted to bei connected by steam pipes to an engine or for other uses.

The superheater units embody an inlet header 32 preferably-made of cast metal' and a similar outlet header 33; with a series of superheater tubes connecting' them at in' l tervals and extending down the flue of theboi-ler towards. the lire box. These headers are in the form of return bends inlet header 32/ having.V a downwardly extending end prortion 34 with a conical outer; end surface. 35 adapted to fit in the conica-l upperV portion 27 ofthe outlet opening 261 and outlet header 33 having a corresponding downwardly en tending portion with a. conicalend surface itting the conicalV upper portion: ofthe inlet openingleadingA tof the` s-uperheatedi steam chamberl 28,k and said. headers are provided on their upper surfaces with integral pro,- jecting lugs adapted to enter sockets in the under surfaceiof' the-metal clamps 37 secured in place in the smoke box L5. These inlet and outlet headers for the superhea-.ter units are securely clamp bolted. in place on the main superheater header casting. Each of the superheater unit headers extends inwardn ly over and. close to the upper tubesheet ll and each has on itsA under surface a series of bosses to which are connected preferably by welding' the ends of superhe'ater p-ipes 39. These superheater pipes as will. be'v seen by reference to Fig. l pass downwardly from the inlet unit header 32 ina verticali direction with a sharp bendr or connection 40 at the lowest point andithen back upwardly in parallel position to-lit within one of thel outlet flues of the boiler. rlhe upper end is connected to a coupling member 4l andl` from that coupling a pipe leads downwardly in another flue of the boiler to aI sharp lower bend 42 and then back to a connection with the socket ofthe outlet unit header.

lt will. be observed that by the arrangement above described' the saturated stean in the upper part of the boiler mustpass tl'irough the superheater before it reaches the point of' use, andi that the superheatingv arrangement is a permanent integral part of the boiler andi requires practically .no excess space but gives largely increased heating sur-face.

As heretofore stated the smoledrum: 15 extends entirely across theA upper part of the" boiler and contains: theA superheater unit headers 32 and3'3 and othenpartsrabove tube sheet 1 1'. In order to cause the; proper distribution and, circulation; of the hot gases of combustion from the lire box soy as to uniformly reach and heat the various parts of the boiler a conical baffle plate 43 is secured to the under surface of the cover for the smoke box 15 around the central smoke stach outlet 44 and terminates at its lower outer margin just above the superheater manifold. A steam exhaust pipe 45 leads intofth-e smolrc box l5 and is connected to a casting 4G con-- taining a chamber 4'? having an upper circular outlet- 48 directly below the smoke stack outlet 44 and supported from the upper tube Sheety lil by the integral depending lugs 49: A casting 50'fitswithin the circular outlet 49 and has a vertical discharge opening or passageway 5l constituting the exhaust nozzle directed centrally towards the smolre stach outlet 44'. Gn the interior of the exhaust discharge passageway 51 spiral inwardly projecting integral ribsv 52 are forme-d so as to create a whirling action ofthe exhaust ste-amV and accompanying gases in the. smoke box and out through the smoke stack. rEhe casting 50: has in it surrounding the exhaust nozzle 5l an annular chamber 58 for live steaml with an entrance connection 54 for a steanrpipe and is provided with upwai-'dhy extending discharge nozzles 55 and it will be understood that by proper regulation of the steam supplied to this chamber the draft and circulation of the hot gases may be accurately controlled. Secured to the exhaust nozzle casting 50 above the casting 47 by means of the projecting` lugs 56 there is a surrounding conical baiile 57 extending upwardly and outwardly towards the conical baille 48 but having a sufficient circularly arranged.' opening between itsy upper margin andv 43 for the passage of the products of combustion. This arrangement causes the products of combustion rising through the center portion of the boilerto pass outwardlytowards the space in the smoke box over the superheater elements before passing' to the smoke stack and avoids localization of the draft and consequent uneven heating;

Having thus described the invention what is claimed as new and desired to be secured by Letters Patent is:

l. In a vertical boilerV having. lower and upper tube sheets and tubes and i'iues con necting said sheets, the combination with top extension. from. said boiler and a cover plate forming a chamber or smoke box. for the gases of combustion with; outlet in the cover plate, of a conica-lg baffle in said box surrounding said outlet and extending downwardly, an exhaust pipein said cham-- ber having a nozzle directed towards said outlet and'having a. plurality of depending lugs resting on said uppertube sheet, and an oppositely turned. conical, baffle secure-d"A to said nozzle over said exhaust pipe.,

, 2; In a vertical boilerfhaving lower; and uflziperI tube sheetsf and tubes and. fines oo;

lll() necting said sheets, the combination with the top extension from said boiler and a cover plate forming a chamber or smoke box for the gases of combustion with an outlet in the cover plate, of a hollow casting in said smoke box having an inlet adapted to be connected to an exhaust pipe and having an opening directed towards said outlet, a nozzle secured in said opening having a plurality of exterior radial lugs, and a conical deflector secured to said lugs.

3. ln a vertical boiler having a cylindrical shell, a lower and an upper tube sheet, tubes and lues connecting said sheets, the combination of a top extension from said boiler with a cover plate forming a chamber or smoke box for the gases of combustion with an outlet for smoke in its center and an exhaust nozzle below and directed towards said outlet and having curved vanes to produce a whirling action of the exhaust steam and gases passing out through said outlet and jet openings surrounding said exhaust nozzle opening and directed towards said outlet and means steam to said jet openings to augment the exhaust.

In testimony whereof I hereunto aflix my signature.

" ROBERT N. MILLER.

for supplying live 

